Improvement in dowel-gauges



ein)

Improvement in Dowel Gauge.

N0. 123,3374. Y Patented Feb. 6, 1872.

' Ff .J Qy-l. go i f L f-H TNW* A l Q j,

V j) Y .8 e d lfzpo'y?. )I 3 0 @0mm l f f" W55 @QJ Iimla' E 12956.

' O OO JZ l 1, l Y Egg a f o i @1" e 5k, j l`\u\\\l5, S\\N-L\\%&.

. M//-/ Q27-, v i

' l Tf1 f UNITED STATES PATENT OFFICE.

JOSEPH ER, OF CLEVELAND, OHIO.

IMPROVEMENT IN DOWEL-GAUGES.

Specification forming part of Letters Patent N o. 123,337, datedFebruary 6, 1872.

To all whom t may concern:

Be it known that I, JOSEPH ER, of (lleveland, in the county of Cuyahogaand State of Ohio, have invented new and useful Improvements in aDowel-Gauge, of which the following is a description, reference beinghad to the accompanying drawing making partof this specification.

SPECIFICATION.

Figures l and 3 are side views of the gauge. Figs. 2 and 4l are planviews. Figs. 5, 6, and 7 are views of the work done by the gauge.

Like letters of reference refer to like parts in the different views.

The nature of this invention relates to a gauge for guiding aboring-bit; and the object thereof is to enable the operator to boredowel-holes in the legs and rails or side pieces of tables, &c., for theinsertion of dowel-pins, so that the said holes in corresponding pieceshall have a regular and true relation to each other for the admissionof said pins, thereby forming a dowel-pin joint in the usual way, and ofwhich gauge the following is a more complete and full description:

In Fig. l, A represents the bed of the gauge, and which consists of aplain fiat board, having on one side a iian ge or gauge-piece, B, soattached thereto that it can be removed and placed in other positions,for a purpose presently shown. O is an adjustable block, secured to 011ecorner of the top of the bed-piece, in the position shown in Fig. 2. Insaid block are guide-holes a for the admission of the bor ing-bit, andwhereby it is guided and held in proper position for boring in themanner as follows: The bed A referred to is fastened to the work-benchin such position as to bring the side or edge shown in Fig. l frontingthe workman. A piece of stuff, D, which may represent a leg of a table,to which the side and end pieces or rails are to be attached, is laidupon the bed A, as shown in Figs. l and 2, in which itwill be seen thatone side of the square part of the leg is placed close to the back sideofthe block C and the end thereof' against the gauge-piece or flange B,as shown in Fig. 2. ln this position of the block the dowel-holes arebored therein by inserting the boring-bit in the holes a, which willguide and hold the bit while boring into the leg or piece of stud' D.The holes therein bored will, as a consequence, be of the same numberand have the saine relation to each other as to position as the holes a.in the block O. In order to bore the holes in the end of the rail orside piece E, Fig. 4, so tha-t they may exactly correspond in relativeposition to the holes bored in the leg D, and which is represented inFig. 5, the block C is removed and secured to the opposite corner ofthebed, as shown in Fig. 4. So also is the gauge B, against which the edgeof the rail is placed so as to cause the hole nearest the edge to bebored the same distance therefrom as the irst hole is from the upper endof the leg D, to which the side piece or rail is to be attached. Inconsequence of the holes a in the block C being in such relation to eachother as shown, it becomes necessary, in order that they may correspondwith the holes bored in the leg, to reverse the position of the blockwhen changing it from one side of the bed A to the other-that is to say,the block must be turned upside down 5 and at the saine time the edge bof the block, shown fronting the operator in Figs. l and 2 must bereversed, thereby bringing the inner edge c, Fig. 2, to the front, asshown in Figs. 3 and 4; This, as will be obvious, will cause an exactrelation of the holes bored in the leg and those bored in the end of theside piece E to be attached thereto. This reversing the end of the blockis not required when the holes are in a right line, as shown in Figs. 6and 7 but which requires to be simply turned upside down in movingitfrom one side of the bed to the other for the purpose of boring thetwo parts to be united. The leg and side piece, when bored, are then puttogether by inserting dowel-pins e in one Vset of holes, which, as aconsequence, wilh't into the holes made in the corresponding piece, andinto which they are driven, thereby completing the joint.

This joint is much more easily made than the ordinary tenonand-mortisejoint; is -also stronger, and can be made in much less time.

A greater or less number of dowel-pins may be used, as the strength andsize of the joint and work may require.

For light work the holes may be'bored in the same line, which will notrequire the block C to be reversed end for end on turning1 it forboring` the companion piece; but for heavy Work the pins should bearranged as shown in Fig. 5, which will make a much stronger joint thanif the pins were al1 in the same right line.

Claim.

Wha-t I claim as my improvement, and desire to secure by Letters Patent,is

The doWel-gauge herein described, consisting of the reversible block C,side pieces B, and bed A, arranged and constructed in the manner as andfor the purpose specified.

JOSEPH ER.

Witnesses:

J. H. BURRIDGE, D. L. HUMPHREY.

